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Usually 12, including the international code (but not the +).
is 2 * abs(q -19). where abs(q-19) = q - 19 if q >= 19 and 19 - q if q <= 19
The sum of p and q means (p+q). The difference of p and q means (p-q).
if q+9=16 q=16-9 q= 7
if the statement is : if p then q converse: if q then p inverse: if not p then not q contrapositive: if not q then not